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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Static subaperture stitching interferometry based on dynamic wavefront modulation with a spatial light modulator.

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    This summary is machine-generated.

    This study introduces a static subaperture stitching interferometry (SSI) method using dynamic wavefront modulation. This technique eliminates mechanical positioning errors for highly accurate complex surface testing.

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    Area of Science:

    • Optical metrology
    • Surface metrology
    • Interferometry

    Background:

    • Subaperture stitching interferometry (SSI) is crucial for complex surface testing.
    • Mechanical positioning errors limit the accuracy of traditional SSI methods.

    Purpose of the Study:

    • To develop a static SSI method to overcome positioning errors.
    • To enhance the accuracy of full-aperture surface reconstruction.

    Main Methods:

    • Utilizing a spatial light modulator (SLM) for dynamic wavefront modulation.
    • Generating tilted spherical waves with an SLM and a spherical lens.
    • Employing Newton iterations for feedback correction to improve wavefront quality.

    Main Results:

    • Achieved full-aperture stitching without system component movement, suppressing positioning errors.
    • Demonstrated high precision on a high-order aspheric surface with a 0.01λ RMS residual wavefront error compared to CGH methods.

    Conclusions:

    • The proposed static SSI method effectively eliminates positioning errors.
    • This technique enables high-precision testing of complex surfaces.